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Squeezed states are an interesting class of quantum states that have numerousapplications. This work presents the design, characterisation, and operation ofa bow-tie optical parametric amplifier (OPA) for squeezed vacuum generation. Wereport the high duty cycle operation and long-term stability of the system thatmakes it suitable for post-selection based continuous-variable quantuminformation protocols, cluster-state quantum computing, quantum metrology, andpotentially gravitational wave detectors. Over a 50 hour continuous operation,the measured squeezing levels were greater than 10 dB with a duty cycle of96.6%. Alternatively, in a different mode of operation, the squeezer can alsooperate 10 dB below the quantum noise limit over a 12 hour period with norelocks, with an average squeezing of 11.9 dB. We also measured a maximumsqueezing level of 12.6 dB at 1550 nm. This represents one of the best reportedsqueezing results at 1550 nm to date for a bow-tie cavity. We discuss thedesign aspects of the experiment that contribute to the overall stability,reliability, and longevity of the OPA, along with the automated locking schemesand different modes of operation.

12.6 dB squeezed light at 1550 nm from a bow-tie cavity for long-term high duty cycle operation